Hi folks,

I wonder how I can put things in the alpha channel...
I want to take an image (eg. screenshot) and paint
partial transparency into the resulting image.

I found out that I can do "Layer -> Add Mask", then
paint (eg using gradients, with "multiply" ) and then
do "Layer -> Apply Mask" which gives me the desired
/visual/ result, but I would like to apply the mask
to the /alpha/ channel and not to the /r/g/b/ channels.

How would I do this?

-- lode

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